The first quick tip I have for my fellow Drupal enthusiasts has to to do with user pictures. Once it is enabled, registered users can upload a picture representing who they are when they go and register on your site. Once you enable this setting, you can decide when you want the pictures to show. You can include them in posts and/or comments.
It's very easy to set up user pictures in Drupal, but you do have to make a few mouse clicks to do this. You have to go to User Settings to turn it on and then to Theme Configuration to show them.